Improvement in grate-bars for furnaces



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STATES PATENT FFlCEO IMPROVEMENT IN GRATE-BARS FOR FURNACES.

Specification forming part ot' Letters Patent No. LMLSSS, dated May 24,1864.

To all 'whom it may concern Be it known that I, J oHN VANDERCAR, of the cit-y of Brooklyn, in the county of Kings and State of N ew York, have invented a new and useful Improvement in Grate-Bars for Furnaces 5 and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, in which- Figure 1 is a plan of two grate-bars constructed according to my invention. Fig. 2 is a side view of one of the bars. Fig. 3 is a transverse section of the same.

Similar letters of reference indicate correparts inthe several tigures.

rlhe object of my invention is to better prevent the warping' ot` the bars, both laterally and vertically, and at the same time to provide eftectually for drat't and for the pricking and raking ofthe tire from below; and to this end it consists in the combination, in one casting, ot three or more single bars with intermediate lateral connections alternating with veach other in position so as to break joint, as hereinafter described with reference to the drawings.

The bars reprt sented each consists of one casting, and are each composed of four single parallel bars, A A, connected together at each end by solid heads B B, and also connected in twos by means of intermediate lateral connections, a a, the said lateral connections extending the whole depth ot' the bar, and those at either side ot' each bar alternating in position with those on the other side, or, in other i. words, those on one side being opposite the f centers of the spaces b b, between those on the other side, as shown in Fig. l. On the exterior sides ot' the outermost ot' the series ot'single bars in each casting there are lateral projections c e, which are opposite the centers ot' the spaces b b, between the partitions c a.,

ot distinction. The single bars A are tapered in a downward direction in their transverse direction, like ordinary single furnace-bars, as shown in Fig. 3, to give clearance to the cinders or ashes which pass between them. The upper surfaces of the bars are straight and their lower edges have an inverted arched form, as shown in Fig. l, to give them stift'- ness in a longitudinal direction. The lateral connections a c between the several single bars not only prevent them from Warpinglat# erally, but from sinking vertically, as no one in a casting can sink without carrying down the whole. The arrangement of the connections a a to alternate or break joint with each other, as described, is a better preventive against warping than if they were arranged opposite each other, as with a given length ot space b it forms connections at double the number of points in the length of each single bar, and this is an importantfeature of my invention.

A greater number than four parallel bars AA may be combined in one casting, but with a less number than three it is not possible to obtain the alternating arrangement of the lateral connections a a, as hereinabove described.

I do not claim, broadly, the casting of the several bars together with intermediate lateral connections when such connections are arranged otherwise than as herein specified but \Vhat l claim as my invention, and desire to secure by Letters Patent, is-

4The combination, in one casting, of three or more parallel imperforate bars, A A A, taperi ig downward in thickness, each formed with a horizontal grooved top and a convex lower edge, the solid heads B B, connecting the said bars together at their ends, the alternating on the opposite sides of said bars, the said prot iections on two adjacent castings fitting toherein speclted.

gether and keeping the two outermost bars of the two castings at a distance apart corresponding with the width ot` the spaces b b, as shown in Fig. l, in which one ofthe two cast` ings is tinted, and the other plain, for the sake intermediate connections, a a c, and the lateral projections c c c, both extending from the upper to the lower edges ot' the bars, all as J O [l N VANlEROAR.

Witnesses:

GILBERT W. BANKER, Jas. R. HALL. 

